php - 基于php if语句在div中添加/更改文本

Question

我有一个创建新用户的页面。我有一个 php 脚本，它对文本字段中输入的数据进行各种检查。当它发现不符合要求的条目时，我需要向用户提供反馈以说明流程终止的原因。我的想法是简单地有一个空的 div，我将用一条特定于失败条件的消息填充它。

然而，看起来这可能比我想象的要难。我更愿意在我的 php 脚本中这样做。我对网络开发还很陌生。我愿意接受有关实现此目标的最佳/最简单方法的建议。谢谢。

<div id="page">
    <img id="mainpic" src="images/banner.png" height="390" width="982">

    <div id="stylized" class="leftsidebox"></div>

     <div id="stylized" class="myform">
        <form id="form" name="form" method="post" action="scripts/create_admin.php">

            <label>Security Code
                <span class="small">Enter the security code provided to you</span>
            </label>
            <input type="text" name="securitycode" id="name" />

            <button type="submit">Create Administrator</button>
        </form>
    </div>

    <div id="stylized" class="rightsidebox">
        <div id="stylized" class="feedback">
            <h1>this is where I want to add dynamic text from php</h1>
        </div>

    </div>
</div>


<?php

    include('connection.php');

    //retrieve input values from the form
    $security_code = $_REQUEST['securitycode'];

    if (strlen($security_code) == 0) {
        //Add the text "Please enter a security code." to the div class="feedback"
        die();
    }
?>

Answer 1

在html之前添加php代码

<?php

    include('connection.php');

    //retrieve input values from the form
    $security_code = $_REQUEST['securitycode'];

    if (strlen($security_code) == 0) {
    $error="Please enter a security code.";    
    //Add the text "Please enter a security code." to the div class="feedback"
        die();
    }
?>

<div id="stylized" class="feedback">
            <h1><?php if(isset($error)){ echo $error; } ?></h1>
        </div>